Overview of the EVS codec architecture

The new 3GPP codec for Enhanced Voice Services (EVS) offers important new features and improvements for low-delay real-time communication systems. Based on a novel, switched low-delay speech/audio codec, the EVS codec contains various advancements for better compression efficiency and higher quality for clean/noisy speech, mixed content and music, including support for wideband, super-wideband and full-band content. The EVS codec operates in a broad range of bitrates, is highly robust against packet loss and provides an AMR-WB compatible mode for compatibility with existing systems.

This paper gives an overview of the underlying architecture as well as the novel technologies in the EVS codec and presents listening test results showing the excellent performance of the new codec in terms of compression and speech/audio quality.